247661402 has 8 divisors (see below), whose sum is σ = 380553012. Its totient is φ = 120810400.

The previous prime is 247661399. The next prime is 247661431. The reversal of 247661402 is 204166742.

It can be written as a sum of positive squares in 2 ways, for example, as 240591121 + 7070281 = 15511^2 + 2659^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×247661402² = 122672340081211208, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1510049 + ... + 1510212.

Almost surely, 2^247661402 is an apocalyptic number.

247661402 is a deficient number, since it is larger than the sum of its proper divisors (132891610).

247661402 is a wasteful number, since it uses less digits than its factorization.

247661402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020304.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 247661402 is about 15737.2615788135. The cubic root of 247661402 is about 627.9900687436.

The spelling of 247661402 in words is "two hundred forty-seven million, six hundred sixty-one thousand, four hundred two".